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=2 x 22/7 x 21 x ( 21 + 28 )
= 2 x 66 x 49
= 6468
maaf ya klu salah....
dik : π = 22/7
t = 28
r = 21
D = 2r = 42
dit : L permukaannya =...?
jawab :
LP tabung = 2 π r²+ π D t
=2.22/7.21.21+ 22/7.42.28
=2772 + 3696
=6468